Furnace attachment



Oct. 9, 1928. r 1,687,214

F. D. KENYON FURNACE ATTACHMENT Filed Dec. 20, 1926 I :5 Sheets-Sheet 1 '1 I In ven for F Kenyon Oct; 9, 1928. 4 1,687,214

F. D. KENYON FURNACE ATTACHMENT Filed Dec. 20, 1926 3 Sheets-Sheen' 2 Kt tornegs.

Oct. 9, 1928.

F. D. KENYON FURNACE ATTACHMENT 3 Sheets-Sheet Filed Dec. 20, 1926 .rn. w J? 8 nuu n en r W w 1 Z Patented a. 9, 192a;

UNITED STATES 1,687,214 PATENT OFFICE.

FREDERICK D. KENYON, 0F MINNEAPQLIS, MINNESOTA, ASSIGNOR QF ONE-HALF TO HARRIET B. BOOT, OF HENNEPIN COUNTY, MINNESOTA.

FURNACE ATTACHMENT.

Application filed December 20, 1926. Serial No. 155,907

My invention relates to furnace attachments and an object is to provide means for securing more perfect combustion of coal or similar fuel than is possible in furnaces commonly in use. In furnaces which are in extensive use at the present time, only imperfect combustion of the fuel is obtained anda considerable percentage of the gaseous products from the fuel passes out of the furnace in an unconsumed condition. The result of this is that a large amount of potential heat is not utilized and quantities of smoke and soot are discharged into the atmosphere with resultant injurious effects. In carrying out my invention, I provide an attachment which may be readily applied to various types and I 2 is a sectional elevational view, the section being a central vertical one at right-angles sizes of furnaces and by means of which air is delivered above the burning fuel for mixing with the gas rising therefrom without oh structing the firepot with an air pipe or similar device passing therethrough'.

The full objects and advantages of my invention will appear in connection with the detailed description thereof, andthe novel features of my inventive idea will be particular- 1 pointed out in the claim.

In the accompanying drawings which illustrate one form in which my invention may-be embodied,- y

Fig. 1 is a sectional elevational view of a furnace with my invention applied thereto, the section being a central vertical one. Fig.

to that of Fig. 1 and an air distributer being shown in its operative position. Fig. 3 is a fragmentary sectional view corresponding to a portion offFig, 2 and showing the air distributer in its retracted position. Fig. 4 is a view in vertical section on the line 4-.4 of Fig. 1. Fig. 5 is a view in vertical section on the line 55 of Fig. 3, and on an enlarged scale. i

Referring to the particular construction shown in the drawings, the numeral designates the outer wall of a well-known form of furnace having a charging door 12, an ashpit door 14, grate bars 16.- hot air pipes 18,-a smoke-flue 20, and a firepot 22. Arranged outside of the furnace in any convenient position preferably at one side of the charging door and below the same, there is a blower 24 driven in any suitable manner as by an electric motor 26. The blower has a dischargepipe 28 which extends into the ashpit for delivering air thereinto for passage up between the grate bars and through the fuel placed thereon. Extending u from the pipe 28 outside of the furnace, ;t ere is a branch pipe 30which is preferably in the form of a flexible conduit as shown, At the entrance into this branch pipe, there is a deflector 32 which serves to deflect a port-ion of the air delivered from the blower up into the branch pipe.

Just above the entrance into the branch pipe,

there is a perforated plug 34, the perforation 1n WlllCh may be varied in size according to the character ofthe furnace and the conditions under which the furnace is to be used so that the amount of air passing through the branch pipe may be reduced as considered deslra-ble. The charging door is provided with an opening through which a sleeve 36 extends, this sleeve being held to the door so as to extend inwardly by a circumferential cept for a row of circumferential perforations 44. The tube 40in connection with its perforated end member in effect constitutes an air distributor which sprays air upon the top of the fuel in the fire pot. The tube 40 on its upper and lower sides is provided with longitudinal ribs 46 and 48 as will be understood from Figs. 3 and 5 The outer end of the tube 40 is provided with a handle 50 having a grasping member 52 at its outer end and a ring 54 at its inner end. A set'screw 56 passing through the ring 54 and engaged with the tube 40 prevents the handle from being pulled off. Thering 54 is further provided with grooves into which the aforesaid ribs 46 and 48 fit. The sleeve 36 is provided with similar grooves into which the ribs fit slidably. It will now be understood that the ribs 46 and 48 have a ffour-fold function.

They prevent the handle from turning on the tube 40, they prevent the tube 40 from turning in the sleeve 36, they serve as guides which fit slidably in grooves in the sleeve 36 so that the air distributor may he slid between the positions shown'in Figs. 2 and '3 and finally, they serve to reinforce the tube 40 and prevent it from warping upwardly or downwardly under the influence of expansion and contraction. It will be understood that the air distributor is drawn back into retracted position as shown in Fig. 3 when the charging door is to beopened so asnot to interfere with the free opening thereof. The delivery end of the branch pipe 30 is provided with an the other end to the pipe 3Q'prevents the latterfrom dropping down upon the floor.

. 'The operation and advantages of my invention ave to a large extent already been set forth. The air which passes through the a pipe 28 into the ashpit increases the draft.

he air passing through the branch pipe 30' and through the air distributor is sprayed upon the top of the burning coal and tends to completely oxidize the gas as it rises from the burning fuel. In this manner almost complete combustion is secured, thereby conserving fuel and preventing the accumulation of soot and discharge of black smoke. The tube 40 may be made standard length sufficient for installation in large furnaces and it is a comparatively simple matter to cut off the outer end of the tube for adaptingthe tube to be installed in smaller furnaces. The attachment may, therefore, be readily applied to various sizes and types of furnaces.

I .claim e A furnace attachment comprising a blower, a guide sleeve secured to the inner side of the charging door of the furnace, an air dis-1 tributor tube slidably mounted in said sleeve, a flexible conduit leading from said blower, a detachable connection for attaching said conduit to the outer end of said tube, a ring detachably secured around the outer end of said tube, and a handle member connected with said ring.

In testimony whereof I hereunto aflix my signature.

FREDERICK D. IGDNYON. 

